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Air carrier ready for departure at dal misinterprets ATC clearance; 'unable position and hold' and taxied into position.
| Attributes | |
| ACN | 843156 |
| Time | |
| Date | 200907 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | DAL.Airport |
| State Reference | TX |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Taxi |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain |
| Experience | Flight Crew Last 90 Days 200 Flight Crew Type 12305 |
| Person 2 | |
| Function | First Officer |
| Experience | Flight Crew Last 90 Days 130 Flight Crew Type 130 |
| Events | |
| Anomaly | Deviation - Procedural Clearance Ground Incursion Runway |
Narrative:
Taxiing to runway 13R in dallas just short of the hold short line; I was braking the aircraft to a stop. A company aircraft was just crossing the threshold landing on 13R. Tower evidently said 'unable position and hold'. I did not hear the unable in unable position and hold. I was expecting a position and hold clearance. The first officer did not understand the clearance either. I assumed I had a position and hold clearance and taxied across the hold short line. The tower then said 'unable position and hold' which I understood and stopped the aircraft just on the other side of the hold short line. I was not close to the runway as I was still facing northwest on taxiway C. The tower said; 'I see you crossed the hold short line; go ahead and position and hold'. I did and when we were cleared for takeoff; we departed 13R without incident. No conflict with any other aircraft during the crossing of the hold short line. I should have made sure I understood the clearance before moving the aircraft. Although the phrase unable position and hold lends itself to misunderstanding; I still should have verified the clearance.
Original NASA ASRS Text
Title: Air carrier ready for departure at DAL misinterprets ATC clearance; 'unable position and hold' and taxied into position.
Narrative: Taxiing to Runway 13R in Dallas just short of the hold short line; I was braking the aircraft to a stop. A Company aircraft was just crossing the threshold landing on 13R. Tower evidently said 'unable position and hold'. I did not hear the unable in unable position and hold. I was expecting a position and hold clearance. The First Officer did not understand the clearance either. I assumed I had a position and hold clearance and taxied across the hold short line. The Tower then said 'unable position and hold' which I understood and stopped the aircraft just on the other side of the hold short line. I was not close to the runway as I was still facing northwest on Taxiway C. The Tower said; 'I see you crossed the hold short line; go ahead and position and hold'. I did and when we were cleared for takeoff; we departed 13R without incident. No conflict with any other aircraft during the crossing of the hold short line. I should have made sure I understood the clearance before moving the aircraft. Although the phrase unable position and hold lends itself to misunderstanding; I still should have verified the clearance.
Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.